An integral molded plastic closure for a container opening, wherein the closure comprises a base, a spout separated from the base and a collapsible bellows joining the base and the spout; integrally formed with and to the spout is a separable closure element comprising a hollow cylinder closed off by a sealing disc; the open end of the closure element cylinder is integrally formed to the open end of the spout; a tearable section integral with both the closure element cylinder and the spout is defined between these elements, whereby the cylinder may be separated from the spout; the spout opening and the closure element cylinder are cooperatingly contoured to enable the closure element spout to pass into and seal the spout opening.